#include <iostream>
#include <string>
int main(int argc,char const *argv[])
{
    int val_1 =10;//整形
    double val_2=10.1;//浮点型

    //字符串类型
    std::string str_1="张三";
    std::string str_2="李四";

    //输出
    std::cout<<"val_1="<<val_1<<std::endl;
    std::cout<<"val_2="<<val_1<<std::endl;

    std::cout<<"str_1="<<str_1<<std::endl;
    std::cout<<"str_1="<<str_1+str_2<<std::endl;

    // 输入 输出
    std::cin >> val_1;
    std::cout << "val_1 = " << val_1 << std::endl;

   return 0;
}